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Diffstat (limited to 'doc/api_ref/env_vars.rst')
| -rw-r--r-- | doc/api_ref/env_vars.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/doc/api_ref/env_vars.rst b/doc/api_ref/env_vars.rst new file mode 100644 index 000000000..221a22545 --- /dev/null +++ b/doc/api_ref/env_vars.rst @@ -0,0 +1,20 @@ +Environment Variables +====================== + +Certain environment variables can affect or tune the behavior of the +library. The variables and their behavior are described here. + +* ``BOTAN_THREAD_POOL_SIZE`` controls the number of threads which will be + created for a thread pool used for some purposes within the library. If not + set then it defaults to the number of CPUs available on the system. + +* ``BOTAN_MLOCK_POOL_SIZE`` controls the total amount of memory which will be + locked in memory using ``mlock`` or ``VirtualLock`` and managed in a memory + pool. If set to ``0`` (or indeed any value smaller than the system page size), + then the memory pool is disabled. + +* ``BOTAN_FFI_PRINT_EXCEPTIONS`` if this variable is set (to any value), then + if an exception is caught by the FFI layer, before returning an error code, it + will print the text message of the exception to stderr. This is primarily + intended for debugging. + |